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                                <h1 id="&#x5185;&#x6838;&#x865A;&#x62DF;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x4E4B;&#x5806;&#x5185;&#x5B58;">&#x5185;&#x6838;&#x865A;&#x62DF;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x4E4B;&#x5806;&#x5185;&#x5B58;</h1>
<h2 id="&#x4E00;&#x3001;&#x63CF;&#x8FF0;">&#x4E00;&#x3001;&#x63CF;&#x8FF0;</h2>
<p>&#x5BF9;&#x4E8E;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x6765;&#x8BF4;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528; <code>malloc</code> &#x548C; <code>free</code> &#x6765;&#x52A8;&#x6001;&#x5730;&#x5206;&#x914D;&#x5185;&#x5B58;&#xFF0C;&#x90A3;&#x4E48;&#xFF0C;&#x5BF9;&#x4E8E;&#x5185;&#x6838;&#x6765;&#x8BF4;&#xFF0C;&#x4E5F;&#x9700;&#x8981;&#x8FD9;&#x6837;&#x7684;&#x529F;&#x80FD;&#x3002;
&#x6240;&#x4EE5;&#xFF0C;&#x9700;&#x8981;&#x5728;&#x5185;&#x6838;&#x4E2D;&#x5B9E;&#x73B0;&#x540C;&#x6837;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x5728; <code>nxos</code> &#x91CC;&#x9762;&#xFF0C;&#x5B83;&#x4EEC;&#x662F; <code>NX_MemAlloc</code> &#x548C; <code>NX_MemFree</code>&#x3002;</p>
<p>&#x6211;&#x4EEC;&#x662F;&#x4F7F;&#x7528;&#x57FA;&#x4E8E;&#x7F13;&#x5B58;&#x7684;&#x94FE;&#x8868;&#x6765;&#x7BA1;&#x7406;&#x5806;&#xFF0C;&#x8FD9;&#x79CD;&#x65B9;&#x5F0F;&#x7684;&#x539F;&#x7406;&#x662F;&#xFF0C;&#x5728;&#x91CA;&#x653E;&#x4E00;&#x4E2A;&#x9875;&#x9762;&#x540E;&#xFF0C;&#x4F1A;&#x653E;&#x5230;&#x4E00;&#x4E2A;&#x94FE;&#x8868;&#x4E0A;&#x9762;&#xFF0C;&#x4E0B;&#x6B21;&#x5206;&#x914D;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x76F4;&#x63A5;&#x4ECE;&#x94FE;&#x8868;&#x83B7;&#x53D6;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#x5373;&#x53EF;&#x3002;</p>
<h2 id="&#x4E8C;&#x3001;&#x539F;&#x7406;">&#x4E8C;&#x3001;&#x539F;&#x7406;</h2>
<p>&#x5728; <code>heap cache</code> &#x7B97;&#x6CD5;&#x4E2D;&#xFF0C;&#x6BCF;&#x4E2A;&#x5C0F;&#x7684;&#x5BF9;&#x8C61;&#x90FD;&#x6709;&#x4E00;&#x4E2A;&#x5BF9;&#x5E94;&#x7684;&#x94FE;&#x8868;&#x6765;&#x7BA1;&#x7406;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#xFF0C;&#x5206;&#x914D;&#x7684;&#x65F6;&#x5019;&#x5148;&#x53BB;&#x94FE;&#x8868;&#x4E0A;&#x83B7;&#x53D6;&#x5BF9;&#x8C61;&#xFF0C;
&#x6CA1;&#x6709;&#x5BF9;&#x8C61;&#x624D;&#x91CD;&#x65B0;&#x4ECE;&#x7269;&#x7406;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x5668;&#x4E2D;&#x5206;&#x914D;&#xFF0C;&#x6709;&#x7684;&#x8BDD;&#x5C31;&#x76F4;&#x63A5;&#x4ECE;&#x94FE;&#x8868;&#x4E0A;&#x9762;&#x6458;&#x53D6;&#x3002;
&#x91CA;&#x653E;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x4E5F;&#x662F;&#x5148;&#x91CA;&#x653E;&#x5230;&#x94FE;&#x8868;&#x4E0A;&#x9762;&#xFF0C;&#x5F53;&#x94FE;&#x8868;&#x8D85;&#x51FA;&#x4E86;&#x6700;&#x5927;&#x94FE;&#x8868;&#x957F;&#x5EA6;&#x9608;&#x503C;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x624D;&#x4F1A;&#x91CA;&#x653E;&#x5230;&#x7269;&#x7406;&#x5185;&#x5B58;&#x5206;&#x914D;&#x5668;&#x4E2D;&#x3002;</p>
<p>&#x5728; <code>heap cache</code> &#x4E2D;&#xFF0C;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#x88AB;&#x5212;&#x5206;&#x6210;3&#x7C7B;&#xFF0C;&#x5C0F;(16byte &lt;= <code>size</code> &lt;= 256kb)&#x3001;&#x4E2D;(256kb &lt; <code>size</code> &lt;= 1mb)&#x3001;&#x5927;(<code>size</code> &gt; 1mb)&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#x3002;
&#x5BF9;&#x4E8E;&#x5C0F;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#xFF0C;&#x4F1A;&#x5212;&#x5206;&#x5F97;&#x6BD4;&#x8F83;&#x7EC6;&#xFF0C;&#x5982;&#xFF1A;16, 32, 48, 64, 80, 96, 112, 128&#x7B49;&#x3002;
&#x5BF9;&#x4E8E;&#x4E2D;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#xFF0C;&#x5C31;&#x662F;&#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x94FE;&#x8868;&#x6765;&#x7BA1;&#x7406;&#x3002;
&#x5BF9;&#x4E8E;&#x5927;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#xFF0C;&#x5C31;&#x76F4;&#x63A5;&#x4ECE;&#x7269;&#x7406;&#x5185;&#x5B58;&#x7BA1;&#x7406;&#x5668;&#x5206;&#x914D;&#x548C;&#x91CA;&#x653E;&#xFF0C;&#x4E0D;&#x4F7F;&#x7528;&#x94FE;&#x8868;&#x7BA1;&#x7406;&#x3002;</p>
<h2 id="&#x4E09;&#x3001;&#x6846;&#x67B6;&#x56FE;">&#x4E09;&#x3001;&#x6846;&#x67B6;&#x56FE;</h2>
<p><img src="figures/heap-cache.png" alt="&#x6846;&#x67B6;&#x56FE;"></p>
<h2 id="&#x56DB;&#x3001;&#x63A5;&#x53E3;">&#x56DB;&#x3001;&#x63A5;&#x53E3;</h2>
<p>&#x5185;&#x6838;&#x5206;&#x914D;&#x5806;&#x5185;&#x5B58;&#x7684;&#x63A5;&#x53E3;&#xFF0C;&#x9700;&#x8981;&#x4F20;&#x5165;&#x5F85;&#x5206;&#x914D;&#x5185;&#x5B58;&#x7684;&#x5927;&#x5C0F;&#xFF0C;&#x5373;&#x53EF;&#x83B7;&#x53D6;&#x4E00;&#x4E2A;&#x5185;&#x5B58;&#x5730;&#x5740;&#xFF0C;&#x5982;&#x679C;&#x4E3A;&#x7A7A;&#xFF0C;&#x90A3;&#x4E48;&#x5C31;&#x662F;&#x5206;&#x914D;&#x5931;&#x8D25;&#x4E86;&#x3002;
&#x901A;&#x5E38;&#xFF0C;&#x5185;&#x6838;&#x4F1A;&#x4F7F;&#x7528; <code>NX_MemAlloc</code> &#x53BB;&#x5206;&#x914D;&#x5185;&#x5B58;&#x3002;</p>
<pre><code class="lang-c"><span class="hljs-function"><span class="hljs-keyword">void</span> *<span class="hljs-title">NX_HeapAlloc</span><span class="hljs-params">(NX_Size size)</span></span>;
<span class="hljs-meta">#<span class="hljs-meta-keyword">define</span> NX_MemAlloc(size) NX_HeapAlloc(size)</span>
</code></pre>
<p>&#x5185;&#x5B58;&#x91CA;&#x653E;&#x5806;&#x5185;&#x5B58;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x9700;&#x8981;&#x4F20;&#x5165;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#x5730;&#x5740;&#xFF0C;&#x5E76;&#x8FD4;&#x56DE;&#x91CA;&#x653E;&#x7684;&#x72B6;&#x6001;&#x3002;
&#x901A;&#x5E38;&#xFF0C;&#x5185;&#x6838;&#x4F1A;&#x4F7F;&#x7528; <code>NX_MemFree</code> &#x53BB;&#x91CA;&#x653E;&#x5185;&#x5B58;&#x3002;</p>
<pre><code class="lang-c"><span class="hljs-function">NX_Error <span class="hljs-title">NX_HeapFree</span><span class="hljs-params">(<span class="hljs-keyword">void</span> *object)</span></span>;
<span class="hljs-meta">#<span class="hljs-meta-keyword">define</span> NX_MemFree(ptr) NX_HeapFree(ptr)</span>
</code></pre>
<p>&#x9664;&#x6B64;&#x4E4B;&#x5916;&#xFF0C;&#x8FD8;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;&#x83B7;&#x53D6;&#x67D0;&#x4E2A;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#x5927;&#x5C0F;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x4F20;&#x5165;&#x5730;&#x5740;&#x5373;&#x53EF;&#x83B7;&#x53D6;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#x6240;&#x5728;&#x7684; <code>cache</code> &#x7684;&#x5927;&#x5C0F;&#x3002;
&#x4F7F;&#x7528;&#x7684;&#x65F6;&#x5019;&#x9700;&#x8981;&#x6CE8;&#x610F;&#xFF0C;&#x5FC5;&#x987B;&#x662F;&#x901A;&#x8FC7; <code>NX_HeapAlloc</code> &#x5206;&#x914D;&#x7684;&#x5185;&#x5B58;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-c"><span class="hljs-function">NX_Size <span class="hljs-title">NX_HeapGetObjectSize</span><span class="hljs-params">(<span class="hljs-keyword">void</span> *object)</span></span>;
</code></pre>

                                
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